The SPDR Gold Shares (GLD) ETF tracks the price of gold bars on the OTC market, and is a popular choice for those looking to invest in gold through a Gold IRA broker. VelocityShares' long gold ETN (UGLD) aims to provide three times the return of the S&P GSCI Gold ER Index in a single day, making it an attractive option for those who are looking for a higher return on their gold investments. The value of GLD shares is directly related to the value of the gold held by GLD (minus its expenses), and fluctuations in the price of gold could materially and negatively affect investment in stocks. GLD does not generate any revenue, and since GLD regularly sells gold to pay its current expenses, the amount of gold represented by each stock will decrease over time to that point.